Insulated Sheathing Panel and Methods for Use and Manufacture Thereof

ABSTRACT

Insulated wall and roof sheathing systems for use in building construction designed to provide moisture permeable wall panels that protect from bulk water, excess air, and thermal transfer.

CROSS REFERENCE TO RELATED APPLICATIONS

This invention claims the benefit of priority to U.S. Provisional Application No. 61/654,064, filed on May 31, 2012, which is incorporated by reference herein in its entirety.

FIELD OF INVENTION

The present invention relates generally to insulated sheathing systems for use in building construction designed to provide moisture permeable panels that protect from bulk water, air and heat transfer. More particularly, the invention relates to sheathing systems comprising structural panels having liquid barriers, an insulating layer, and a sealant, which seals the seams between adjoining panels and the method of installing the system.

BACKGROUND

Wall and roof panel construction systems of residential or commercial buildings do not typically provide simple, efficient, and safe means of installation. Most often in these systems, extra steps must typically be added to the installation process to prevent liquid moisture, air, and heat from passing through the wall.

Constructing a wall with a weather barrier requires not only that panels be attached to framing members, but also a house wrap is unrolled and spread over the walls. The house wrap is attached to the sheathing panels with staples or button cap nails and fenestration openings for windows or doors must be cut out of the wrap and the flaps from these openings folded back and stapled down. The house wrap is often difficult to install because it is in typical nine-ft wide rolls, which can be cumbersome to maneuver by workers on scaffolding or in windy conditions. While it is important that the barrier layer shed bulk water, it should allow for the escape of water vapor. Moreover, since house wraps are only fastened at limited points, pockets or voids form between the sheathing and house wrap. If the barrier were to trap water vapor in a wall panel, the build-up of moisture could lead to rot or mold growth. Further, certain sheathing materials, such as oriented strand board (OSB), are known to irreversibly swell and warp when exposed to moisture.

Furthermore, small gaps along the edges of adjoining panels typically remain after installation assembly. These thermal gaps within the building envelope allow undesirable thermal energy entry and escape through the walls. Although house wrap can provide some protection, breaks or tears in the house wrap often form during installation or construction. Foam insulation sheathing has also been used to improve thermal resistance performance of building structures. However, insulation sheathing also presents certain limitations and challenges. In addition to frequently suffering physical damage during installation and construction, the structural properties of insulation sheathing relegates it to limited building applications. Insulation sheathing panels are typically fastened as exterior cladding to the outermost, exterior facing of the wall with nails, screws or staples. Once again, this is an extra step that must be added to the installation process. Moreover, as an additional fastened layer, pockets or voids inevitably form between it and the surface it is secured to. Moreover, most insulation sheathing can also limit external finishing options.

In addition to wall panel systems, roof panel construction systems of residential or commercial buildings do not typically provide simple, efficient, and safe means of installation. The roof of a residential or commercial building is typically constructed by attaching several roofing panels to the rafters of an underlying supporting structural frame; the panels are most often placed in a quilt-like pattern with the edge of each panel contacting the edges of adjacent panels so as to form a substantially continuous flat surface atop the structural frame.

However, problems with roofs constructed according to this method may present themselves. Like wall panels, small gaps along the edges of adjoining roofing panels remain after roof assembly. Because the roofing panels are typically installed days or even weeks before shingles are installed, it is important to have a panel system that minimizes leakage resulting from exposure to the elements until such time as the roof is completed. To prevent water from leaking through the gaps between panels, it is commonly known in the industry to put a water resistant barrier layer on top of the roofing panels (e.g., felt paper).

While it is important that the barrier layer shed bulk water, it should also allow for the escape of water vapor. If the barrier were to trap water vapor in a roofing panel, the build-up of moisture could lead to rot or mold growth that is undesirable. As mentioned previously, it is known in the art that substantial bulk water-impermeability of installed roofing panels is achieved by adding a layer of impermeable material, such as asphalt-impregnated roofing paper or felt over the external surface of the roof panels. However, while this provides additional protection against bulk water penetration, it has the disadvantage of being difficult and time-consuming to install because the paper or felt must be first unrolled and spread over the roof surface and then secured to those panels. Further, the use of a felt paper overlay often results in a slick or slippery surface, especially when wet. Additionally, when the felt paper is not securely fastened to the roof panels or becomes loose due to wind and other weather conditions or because of poor construction methods, the roof system can become very slippery and leak bulk water. Accordingly, a worker walking atop the felt paper must be careful to avoid slipping or sliding while thereon.

It is desirable for wall sheathing panels to shed precipitation, such as rain and snow, during construction so that the interior remains dry. Accordingly, there is a need in the art for wall-sheathing panels, which are resistant to bulk water but permeable to water vapor, provide improved thermal resistance and create a simplified, safe, and time-saving installation process.

Accordingly, there is also a need in the art for roofing panels, which can be conveniently fit together and yet are constructed to minimize the gaps or allow the gaps to be sealed between adjacent roofing panels to prevent or minimize the penetration of bulk water through the roof as it travels over the roof's surface. It is desirable for roofing panels to shed precipitation, such as rain and snow, during construction so that the interior remains dry.

Given the foregoing, there is a continuing need to develop improved panels for roof and wall construction that prevent or minimize the penetration of bulk water, that come pre-equipped with a water permeable barrier layer applied during manufacture, and that have improved thermal performance.

SUMMARY OF THE INVENTION

In one aspect, the invention relates to a panel for a sheathing system comprising structural panels, a mass-transfer barrier, an insulation layer, and seam sealant.

In another exemplary aspect, the invention relates to panel system to externally envelope a structure, the system comprising: a) at least two panels, each panel including an outer surface, an inner surface, and at least one edge, each panel aligned with at least one edge proximate to at least one edge of at least one adjacent panel; b) a barrier layer secured to at least the outward facing surface of each panel, the barrier layer being substantially bulk water resistant; c) an insulation layer secured to the inward facing surface of said panel; and d) a bulk water resistant edge sealant sealing at least one gap of the at least one edge of each panel proximate to the at least one edge of each adjacent panel.

In another exemplary aspect, the invention relates to a method for externally sheathing and insulating a building structure, the method comprising the steps of: a) providing at least two panel assemblies, each panel assembly comprising: i) a panel comprising at least one lignocellulosic material, and each panel having an outward facing surface, an inward facing surface, and at least one edge; ii) a barrier layer secured to the outward facing surface of each panel, the barrier layer being substantially bulk water resistant; and iii) an insulation layer secured to the inward facing surface of each panel; b) positioning each panel assembly such that the insulation layer contacts the structure; c) fastening each panel assembly to the structure; and d) sealing at least one gap of at least one edge of each panel proximate to at least one edge of each adjacent panel.

In further aspects, the invention also relates to systems using the disclosed insulated panels, which provide a barrier to bulk water, excess air and heat transfer, irritants, insects and mold that can be permeable to moisture movement, an inner insulating layer, and is suitable for use behind numerous exterior finishes, such as siding, EIFS, brick, stucco, lap siding, vinyl, and the like.

In still further aspects, the invention also relates to methods for installing the disclosed insulated panels.

In still further aspects, described herein are panels affixed with an outward facing barrier layer, and an inward facing insulation layer which are fastened to a building frame in a side-by-side manner, with or without a tongue and groove connection. Next, a sealant, such as tape, laminate, caulk, foam, spray, putty, mechanical fasteners, or any other suitable sealing mechanism, is used to seal the joints or seams between adjoining panels, thus completing the insulated, water barrier.

Additional advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or can be learned by practice of the invention. The advantages of the invention will be realized and attained by means of the elements and combinations particularly pointed out in the appended claims. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.

BRIEF DESCRIPTION OF THE FIGURES

The accompanying figures, which are incorporated in and constitute a part of this specification, illustrate several aspects and together with the description serve to explain the principles of the invention.

FIG. 1 shows a perspective view of a panelized roofing system utilizing the panel of the present invention.

FIG. 2 shows an exploded perspective view of a first embodiment of one panel of the present invention.

FIG. 3 shows a view of a panel and bather layer according to the present invention.

FIG. 4 shows an exploded perspective view of a panel, showing a detailed exploded view of the textured surface, according to the present invention.

FIG. 4A shows a cross-sectional view of the textured surface taken along the line 4A-4A of FIG. 4.

FIG. 5 shows a partial cross-sectional view of two adjacent panels according to one embodiment of the present invention.

FIG. 6 shows a perspective view of a panel according to an embodiment of the present invention.

FIG. 7 shows a perspective view of a three-dimensional wall sheathing system utilizing the panel according to another embodiment of the present invention showing adjacent wall panels with lengths of tape sealing the joints therebetween, each of the lengths of tape overlapping at least one of the joints.

FIG. 8 shows an exploded view of an embodiment of the structural panel according to the present invention and a view of the glueline for permanent bonding of the surface overlay member to the panel.

FIG. 9A shows a partial cross-sectional view of two adjacent panels according to one embodiment of the present invention with tongue-and-groove connected panels after seam sealing.

FIG. 9B shows a cross-sectional view of two adjacent panels according to one embodiment of the present invention in a wall sheathing system with edge abutting connected panels after seam sealing.

FIG. 10 shows a flow diagram of the steps included in the manufacture of a panel for roof or wall sheathing system according to the present invention.

FIG. 11 shows a plan view of a panel, according to the invention.

FIG. 12A shows a partial plan view of a pair of panels; each according to the invention, aligned for engagement.

FIG. 12B shows a partial plan view of a pair of panels, each according to the invention, engaged.

FIG. 13 shows a diagram of box plots showing the differences in the coefficient of friction between paper overlaid wood composite panels with smooth and textured surfaces, oriented strand board with a textured surface, oriented strand board with a sanded surface and plywood in the dry condition.

FIG. 14 shows a diagram of box plots showing the differences in the coefficient of friction between paper overlaid wood composite panels with smooth and textured surfaces, oriented strand board with a textured surface, oriented strand board with a sanded surface and plywood in the dry condition.

FIG. 15 shows a diagram of box plots showing the differences in the coefficient of friction between paper overlaid wood composite panels with a smooth and textured surface and plywood in the wet condition.

DETAILED DESCRIPTION

Before the present compositions, articles, devices, and/or methods are disclosed and described, it is to be understood that the aspects described below are not limited to specific methods as such may, of course, vary. It is also to be understood that the terminology used herein is for the purpose of describing particular aspects only and is not intended to be limiting. As used in the specification and in the claims, the term “comprising” may include the embodiments “consisting of” and “consisting essentially of.”

Disclosed are materials, compositions, and components that can be used for, can be used in conjunction with, can be used in preparation for, or are products of the disclosed method and compositions. These and other materials are disclosed herein, and it is understood that when combinations, subsets, interactions, groups, etc. of these materials are disclosed that while specific reference of each various individual and collective combinations and permutation of these compounds can not be explicitly disclosed, each is specifically contemplated and described herein. Thus, if a class of adhesives A, B, and C are disclosed as well as a class of additives D, E, and F and an example of a combination A-D is disclosed, then even if each is not individually recited, each is individually and collectively contemplated. Thus, in this example, each of the combinations A-E, A-F, B-D, B-E, B-F, C-D, C-E, and C-F are specifically contemplated and should be considered disclosed from disclosure of A, B, and C; D, E, and F; and the example combination A-D. Likewise, any subset or combination of these is also specifically contemplated and disclosed. Thus, for example, the sub-group of A-E, B-F, and C-E are specifically contemplated and should be considered disclosed from disclosure of A, B, and C; D, E, and F; and the example combination A-D. This concept applies to all aspects of this disclosure including, but not limited to, compositions, and steps in methods of making and using the disclosed compositions. Thus, if there are a variety of additional steps that can be performed it is understood that each of these additional steps can be performed with any specific embodiment or combination of embodiments of the disclosed methods, and that each such combination is specifically contemplated and should be considered disclosed.

Unless otherwise expressly stated, it is in no way intended that any method set forth herein be construed as requiring that its steps be performed in a specific order. Accordingly, where a method claim does not actually recite an order to be followed by its steps or it is not otherwise specifically stated in the claims or descriptions that the steps are to be limited to a specific order, it is no way intended that an order be inferred, in any respect. This holds for any possible non-express basis for interpretation, including: matters of logic with respect to arrangement of steps or operational flow; plain meaning derived from grammatical organization or punctuation; and the number or type of embodiments described in the specification.

All parts, percentages and ratios used herein are expressed by weight unless otherwise specified.

In this specification and in the claims which follow, reference will be made to a number of terms which shall be defined herein.

As used in the specification and the appended claims, the singular forms “a,” “an,” and “the” include plural referents unless the context clearly dictates otherwise.

“Optional” or “optionally” means that the subsequently described event or circumstance can or cannot occur, and that the description includes instances where the event or circumstance occurs and instances where it does not.

Ranges can be expressed herein as from “about” one particular value, and/or to “about” another particular value. When such a range is expressed, another aspect includes from the one particular value and/or to the other particular value. Similarly, when values are expressed as approximations, by use of the antecedent “about,” it will be understood that the particular value forms another aspect. It will be further understood that the endpoints of each of the ranges are significant both in relation to the other endpoint, and independently of the other endpoint. It is also understood that there are a number of values disclosed herein, and that each value is also herein disclosed as “about” that particular value in addition to the value itself. For example, if the value “10” is disclosed, then “about 10” is also disclosed. It is also understood that each unit between two particular units are also disclosed. For example, if 10 and 15 are disclosed, then 11, 12, 13, and 14 are also disclosed.

As used herein, “wood” is intended to mean a cellular structure, having cell walls composed of cellulose and hemicellulose fibers bonded together by lignin polymer. “Wafer board” is intended to mean panels manufactured from reconstituted wood wafers bonded with resins under heat and pressure.

As used herein, “wood composite” or “wood composite material” it is meant a composite material that comprises wood and one or more other additives, such as adhesives or waxes. Non-limiting examples of wood composite materials include oriented strand board (“OSB”), waferboard, particleboard, chipboard, medium-density fiberboard, plywood, and boards that are a composite of strands and ply veneers. As used herein, “flakes” and “strands” are considered equivalent to one another and are used interchangeably. A non-exclusive description of wood composite materials may be found in the Supplement Volume to the Kirk-Othmer Encyclopedia of Chemical Technology, pp. 765-810, 6^(th) edition.

As used herein, “structural panel” is intended to mean a panel product, commonly composed of wood which, in its commodity end use, is essentially dependent upon certain mechanical and/or physical properties for successful end use performance such as plywood. A non-exclusive description may be found in the PS-2-92 Voluntary Product Standard.

While aspects of the present invention can be described and claimed in a particular statutory class, such as the system statutory class, this is for convenience only and one of skill in the art will understand that each aspect of the present invention can be described and claimed in any statutory class. Unless otherwise expressly stated, it is in no way intended that any method or aspect set forth herein be construed as requiring that its steps be performed in a specific order. Accordingly, where a method claim does not specifically state in the claims or descriptions that the steps are to be limited to a specific order, it is no way intended that an order be inferred, in any respect. This holds for any possible non-express basis for interpretation, including matters of logic with respect to arrangement of steps or operational flow, plain meaning derived from grammatical organization or punctuation, or the number or type of aspects described in the specification.

Throughout this application, various publications are referenced. The disclosures of these publications in their entireties are hereby incorporated by reference into this application in order to more fully describe the state of the art to which this pertains. The references disclosed are also individually and specifically incorporated by reference herein for the material contained in them that is discussed in the sentence in which the reference is relied upon. Nothing herein is to be construed as an admission that the present invention is not entitled to antedate such publication by virtue of prior invention. Further, the dates of publication provided herein may be different from the actual publication dates, which can require independent confirmation.

The following describes exemplary embodiments of the present invention which provides panels for a panelized sheathing system, attached to a frame structure, and that are suitable for use in the construction of residential and commercial buildings.

A. Use of Panel for Roof Sheathing

In one aspect, FIG. 1 illustrates a panelized roof sheathing construction system 10 for a building having a plurality of panels 20 attached to a building frame structure in substantially abutting relationship. The panels 20 have an inward facing surface 22, an outward facing surface 24 and at least one peripheral edge. In a further aspect, the system 10 also includes a plurality of water resistant barrier layers 30 adhesively secured to at least one of the surfaces 22, 24 of the panels 20, each barrier layer 30 providing a substantially skid-resistant and bulk water resistant surface. One example of a paper overlaid wood board is shown and described in U.S. Pat. No. 6,737,155 entitled “Paper Overlaid Wood Board and Method of Making the Same” which is incorporated herein by reference. In a still further aspect, the system 10 also includes an insulation layer 21 adhesively secured to at least one of the surfaces 22, 24 of the panels 20, each insulation layer 21 providing increased structural and thermal performance. In a yet further aspect, the system 10 preferably includes a plurality of water-resistant sealants 40, each of the sealants 40 sealing at least one of the joints 25 between the adjacent panels 20.

In various aspects, the panels 20 prepared according to the present invention may be made from a variety of different materials, such as wood or wood composite materials. In one aspect, the panels 20, as shown in FIG. 2, are preferably comprised of an oriented strand board substrate (“OSB”) having at least two surfaces 22, 24 with at least one core layer 26 disposed between them. In a further aspect, the OSB panels are derived from a starting material that is naturally occurring hard or soft woods, singularly or mixed, whether such wood is dry (preferably having a moisture content of between 2 wt % and 12 wt %) or green (preferably having a moisture content of between 30 wt % and 200 wt %) or of moisture content in between dry and green (preferably having a moisture content of between 12 wt % and 30 wt %). Typically, the raw wood starting materials, either virgin or reclaimed, are cut into veneers, strands, wafers, flakes, or particles of desired size and shape, which are well known to one of ordinary skill in the art.

In a further aspect, each of the surface layers 22, 24 of the panel 20 are preferably oriented in parallel with the long dimension of the panel 20, and the oriented strand board core 26 preferably includes a plurality of substantially parallel strands 23 that are oriented perpendicular to the strands of the surface layers 22, 24. In a still further aspect, the panels 20 of the panelized roof system 10 may be selected from a number of suitable materials that provide adequate protection against the penetration of bulk water. Generally, the panels of the present invention are comprised of reconstituted lignocellulosic furnish. In a further aspect, the panels 20 are comprised of structural wood such as OSB or plywood. In a still further aspect, types of wood material used to manufacture the panels 20 may be, but are not limited to particle board, medium density fiber board, waferboard or the like.

The presently described panels 20, excluding any insulation layer 21, are preferably of a thickness T in a range from about 0.635 cm (0.25 inches) to about 3.175 cm (1.25 inches). In a further aspect, the panels 20 can also comprise a radiant barrier material attached to the lower face of the panel, i.e., to a face of the insulation layer or the face of the panel facing inwardly, toward the interior of the building. In a yet further aspect, the radiant barrier material preferably includes a reflective surface that reflects infrared radiation that penetrates through the roof back into the atmosphere. The combination of this reflective function, as well as the foil's low emissivity, limits the heat transfer to the attic space formed in the interior of the building in the space under the roof. By limiting the heat transfer, the attic space temperature is reduced, which in turn reduces the cost of cooling the house.

In a further aspect, the radiant barrier material can simply be a single layer radiant barrier sheet, such as metal foil, for example, aluminum foil. In a still further aspect, the radiant barrier material can comprise a radiant barrier sheet adhered to a reinforcing backing layer made from a suitable backing material, such as polymeric film, corrugated paper board, fiber board, kraft paper, or a combination thereof. In a yet further aspect, the backing material makes the foil material easier and more convenient to handle. In an even further aspect, the multi-layered material can be a laminate in which a backing material is laminated to a radiant barrier sheet.

Methods of manufacturing a radiant barrier material are discussed in greater detail in U.S. Pat. No. 5,231,814, issued Aug. 3, 1993, to Hageman and U.S. Pat. No. 3,041,219, issued Jun. 26, 1962, to Steck et al. Other suitable radiant barrier material is manufactured under the name SUPER R™ by Innovative Insulation, Inc. of Arlington, Tex. These SUPER R™ products have two layers of aluminum foil each of which have an aluminum purity of 99%, and a reinforcing member located inside, between the two layers. In a further aspect, the reinforcing member can be a reinforcing scrim or a polymer fabric.

Both the radiant barrier material and the barrier layer can be applied to the panel by, for example spreading a coat of adhesive to the surface of the panel, applying the heat-reflecting material (or the barrier layer) over the adhesive onto the panel and pressing the radiant barrier material (or barrier layer) onto the panel. After the adhesive dries or cures, the panel is ready for use.

The radiant barrier can be a coating on either side of the panel 20, which could be used facing into or out from the attic. In a further aspect, the panels 20 can also provide protection against ultraviolet light per ASTM G53, G154, which does not delaminate, does not reduce slip resistance, and does not promote fading.

In one embodiment, FIG. 3 shows a panel for the panelized roof or wall system 10 comprising a barrier layer 30 secured to the outward facing surface of panel 20, with each barrier layer 30 optionally providing a substantially skid-resistant surface 35, and an insulation layer 21 secured to the inward surface of the panel 20.

The barrier layers 30 can optionally be comprised of a resin-impregnated paper 32 having a paper basis weight of, for example, 21.772 kg (48 lbs.) to about 102.058 kg (225 lbs.) per ream or a dry weight of about 78.16 gm/m² (16 lbs./msf) to about 366.75 gm/m² (75 lbs./msf), and preferably substantially cover the outward facing surface 24 of the panels 20. In a further aspect, the paper 32 is preferably resin-impregnated with a resin such as, but not limited to a phenol-formaldehyde resin, a modified phenol-formaldehyde resin, or other suitable resin. In a yet further aspect, the paper has a resin content of about greater than 0% to about 80% by dry weight, most preferably from a range of about 20% to about 70% by dry weight. In a still further aspect, the resin-impregnated paper for the panel in a panelized roof or wall sheathing construction system of the present invention also preferably includes a glueline layer in a range from about 9.77 gm/m² (2 lbs./msf) to about 244.5 gm/m² (50 lbs./msf), and more preferably of a range from about 9.77 gm/m² (2 lbs./msf) to about 177.24 gm/m² (12 lbs./msf). In a yet further aspect, the glueline layer may be formed from a phenol-formaldehyde resin, and isocycanate, or the like.

The barrier layer can optionally comprise an applied coating layer. For example, one such coating is an experimental acrylic emulsion coating from Akzo-Nobel. In a further aspect, another suitable coating is Valspar's Black Board Coating. It is understood that by those skilled in the art that other classes of coatings may serve as an appropriate barrier layer. Thus, in various aspects, coatings may be used in combination with paper overlays to add desired functions to the panel.

According to various aspects, the barrier layers 30 of the disclosed panels are generally resistant to bulk water but permeable to water vapor. For example, the barrier layers can have a water vapor permeance in a range from about 0.1 U.S. perms to about 50.0 U.S. perms, including exemplary water vapor permeance of 0.1, 1, 2, 5, 7, 10, 15, 20, 25, 25, 30, 35, 40, 45, 50 U.S. perms. According to further aspects, the barrier layer can have any water vapor permeance value within any range derived from any of the above exemplified water vapor permeance values, including, for example, from about 0.1 to 20 perms.

Additionally, the barrier layers can have any desired water vapor transmission rate. For example, the barrier layers can have a desired water vapor transmission rate from about 0.1 to about 25 g/m²/24 hrs (at 73° F.-50% RH according to ASTM E96 procedure A), including exemplary water vapor transmission rates of 0.1, 1, 2, 5, 7, 10, 15, 20, 25, 25 g/m²/24 hrs. According to further aspects, the barrier layer can have any water vapor transmission value within any range derived from any of the above exemplified water vapor transmission rates, including, for example, from about 0.7 to about 7 g/m²/24 hrs.

In a further aspect, the barrier layers can have a desired water vapor permeance from about 0.1 to about 50 U.S. perms (at 73° F.-50% RH via ASTM E96 procedure B), including exemplary water vapor permeance of 0.1, 1, 2, 5, 7, 10, 15, 20, 25, 25, 30, 35, 40, 45, 50 U.S. perms. According to further aspects, the barrier layer can have any water vapor permeance value within any range derived from any of the above exemplified water vapor permeance values, including, for example, from about 0.1 to about 12 U.S. perms.

The barrier layers can also have a liquid water transmission rate from about 1 to about 28 grams/100 in²/24 hrs (via Cobb ring) according to ASTM D5795. This test method allows the quantification of liquid water that passes through the underlayment to the underlying substrate and can be easily done on specimens where the underlayment cannot be removed for visual inspection.

In various aspects, the panels of the present invention can further comprise a non-skid surface that has a coefficient of friction equal to or better than plywood or oriented strand board when dry and/or wet can be achieved in a primary process that is both quick and relatively inexpensive. In a further aspect, the water-resistant barrier layers 30 of the present invention advantageously provide a textured surface 35 to the structural panels 20. In a still further aspect, the textured surface 35 is adapted to provide a wet coefficient of friction in a range of from about 0.8 to about 1.1 (English XL Tribometer) and a dry coefficient of friction in a range of from about 0.8 to about 1.1 (English XL Tribometer). Examples of methodology used to measure wet surfaces may be found at pg. 173 in “Pedestrian Slip Resistance; How to Measure It and How to Improve It.” (ISBN 0-9653462-3-4, Second Edition by William English).

In one aspect, the textured surface 35 shown in FIG. 4A is characterized by an embossed pattern of features or indentations. As used herein, “embossing” can mean embossing, debossing, scoring, or any other means to alter the texture of the panel other than adding grit or the like to the surface.

The texture preferably has a number of features or elements disposed in a first direction and a number of features or elements disposed in a second direction. For example, in one aspect, a first group of elements can be disposed in a direction across the width of a panel and a second group of elements can be disposed in a direction along the length of a panel. In a further aspect, the elements or features disposed in first and second directions can be of similar or can be of different sizes. In a further aspect, the elements similarly may be of different or of similar shapes. In a still further aspect, non-limiting examples of similarly sized features include a embossed herringbone or a embossed basketweave configuration. In an yet further aspect, a herringbone pattern may be very tightly disposed or may be somewhat “spread-out” in such a manner so that major channels with minor indentations are created.

In a further aspect, the embossed textured surface is more preferably comprised of a plurality of major or primary textured features and a plurality of minor or secondary textured features. In a still further aspect, the minor or secondary textured features are at least partially disposed on one or more corresponding major feature. Thus, according to one embodiment, while the general appearance of the exemplary textured surface 35 appears to be a random pattern of raised areas, a closer examination of the exemplary textured surface reveals finer detail. In a further aspect, the exemplary textured surface 35 includes a plurality of major channels 33 that are disposed substantially parallel with a pair of opposing edges (preferably the shorter pair of opposing edges) of the panel. In a still further aspect, a plurality of minor indentations 34 are disposed within the major channels 33 and run generally orthogonally to the major channels. It should be appreciated that the exploded magnified view of FIG. 4, showing the minor indentations 34 and major channels 33 in detail, is illustrative and does not necessarily represent the preferred density of minor indentations or major channels.

In various aspects, the present invention provides for advantageous slip-resistance by providing any number of major channels. In a further aspect, the density of the major channels is about 5 to about 15 major channels per 2.54 cm (1 inch) as measured in a direction perpendicular to the direction of the major channels. In a still further aspect, the density of the major channels is about 9 to about 12 major channels per 2.54 cm (1 inch) as measured in a direction perpendicular to the direction of the major channels. On a typical 1.219 m×2.438 m (4′×8′) sheathing panel, the major channels will preferably run generally across the 1.219 m (4′) or short direction. It should be appreciated that it is not necessary nor required that the major channels be exactly parallel and may undulate slightly from side to side in a somewhat serpentine fashion rather than being straight.

In a further aspect, the minor indentations 34 according to the present invention may vary in length and width. In a further aspect, the minor indentations 34 preferably have a elongated shape that measures preferably from about 0.0508 cm (0.020 inches) to about 0.254 cm (0.100 inches) in length and from about 0.0254 cm (0.010 inches) to about 0.254 cm (0.100 inches) wide. In various aspects, the present invention provides for advantageous slip-resistance by providing any number of minor indentations. In a further aspect, the density of the minor indentations is about 15 to about 35 of the minor indentations per inch as measured along the direction of the major channels. In a still further aspect, the long direction of the minor indentations preferably extends generally across the eight-foot (or long) direction of a typical panel.

In a further aspect, the textured surface can also, alternatively, be created via a plurality of raised protrusions and grooves. In a still further aspect, the protrusions may have a height in a range of about 0 mils to about 25 mils, preferably from a range of about 3.0 to about 13.0 mils as measured by profilometry (Mitutoyo SJ201P).

In accordance with the exemplary configuration of the textured surface 35, in a typical roof sheathing application using 1.219 m×2.438 m (4′×8′) panels where the 2.438 m (8′) edge of the sheathing panel is parallel to the floor of the home, the major channels 33 will generally be oriented up and down, while the long direction of the minor indentations 34 will generally run across the roof. In a further aspect, the depth of the major channels and minor indentations have been found to be in a range of about 5 to about 13 mils as measured by the Mitutoyo Surface Profiler. It should be appreciated that at least some of the major channels and minor indentations may be of a depth greater or deeper than the thickness of the paper (i.e., some of the major channels and minor indentations may be of a depth that would project into the surface of the panel).

An anti-skid surface of the present system advantageously reduces the potential for a ladder leaning thereon to slip. A worker who is applying house wrap or taping house wrap is currently exposed to the risk of his ladder skidding against the slippery surface of house wrap. Current house wrap products create the opportunity for a worker to fall from a ladder that skids against house wrap. The surface of current house wrap products promotes the likelihood of “ladder slip.” Workers have complained that ladders will slide unless they apply a skid resistant product to their ladders.

In one aspect, the barrier layers 30 shown in FIG. 3 can further include indicia 37 for positioning fasteners. U.S. Pat. No. 7,150,128 entitled “Boards Comprising an Array of Marks to Facilitate Attachment” and U.S. Pat. No. 7,882,661 and U.S. Pat. Pub. 2011/0189447, incorporated herein by reference, provides additional detail regarding example fastener indicia 37. In a further aspect, the barrier layers are preferably adapted to receive fasteners in a substantially water-proof manner.

According to further aspects, and as depicted in FIG. 2 and FIG. 3, the panel 20 for the panelized roof or wall system 10 can comprise an insulation layer 21 secured to the inward facing surface 22 of panel 20. In further exemplary aspects, the insulation layer 21 at least substantially covers the inward facing surface 22 of the panels 20.

The insulation layer can comprise any suitable insulation material conventionally known to one of ordinary skill in the art. For example, the insulation layer can comprise a foam polymer insulation, including for example and without limitation, polyisocyanurate foam, polystyrene foam, polyurethane foam, or any combination thereof. In further aspects, the foam insulation layer comprises polyisocyanurate foam. In still further aspects, the foam insulation layer can comprise a blend or combination of a polyisocyanurate and polyurethane foam.

The foam insulation layer can comprise extruded foam, expanded foam, or a combination thereof. As one of ordinary skill in the art will appreciate, extruded foams can be prepared by melting a suitable polymer material, incorporating a blowing agent to yield a foamed gel, and extruding the foamed gel through a die to form the desired foam layer. Expanded foams can be prepared by subsequent expansion of beads containing a blowing agent, wherein the expanded beads are molded at the time of expansion to form the desired foam layer.

The foam insulation can have any desired density. For example, the foam insulation can have a density of at least about 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, or 20 pounds per cubic feet (pcf) according to ASTM D1622. In further aspects, the foam insulation can have a density in the range of about 1 pcf to about 20 pcf. In still further aspects, the foam insulation density can be any desired value within any range derived from any of the above exemplified values, including, for example, a density in the range from about 2 to about 5 pcf, or from about 1 to about 10 pcf.

The foam insulation can be either closed cell or open cell. Open cell foam is more likely to let water vapor condense inside the cells, thereby reducing the insulation value. Thus, in further exemplary aspects, the foam insulation is closed cell. In still further aspects, the foam insulation is greater than about 50, 60, 70, 80, 90% closed-cell according to ASTM D2856.

Since in various aspects water can negatively impact thermal performance, the insulation, according to exemplary aspects of the disclosure, exhibits limited or substantially no water absorption. For example, the foam insulation exhibits a water absorption of less than about 10, 9, 8, 7, 6, 5, 4, 3, 2, or even less than 1% according to ASTM C209. In further aspects, the foam insulation exhibits a water absorption of less than about 10, 9, 8, 7, 6, 5, 4, 3, 2, or even less than 1% according to ASTM C2842. In still further aspects, the foam insulation can exhibit a water absorption in the range of about 10% to about 0%. In yet further aspects, the water absorption can be any desired value within any range derived from any of the above exemplified values, including, for example, a water absorption in the range from about 0 to about 5%, or from about 1 to about 3.5%.

Moreover, the insulation layer can have any desired water vapor permeance (or transmission). For example, the water vapor permeance can be less than about 20, 15, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0.5, or even less than 0.1 perms according to ASTM E96. In further aspects, the water vapor permeance can be in the range of about 0.1 to about 20 perms. In still further aspects, the water vapor permeance can be any desired value within any range derived from any of the above exemplified values, including, for example, a water vapor permeance in the range from about 0 to about 2 perms, or from about 1 to about 5 perms.

The insulation layer can have any desired thickness (t). This thickness (t) can be customized to fit any particular application and desired thermal resistance. For example, and without limitation, the thickness of the foam insulation layer can be in the range of from about 0.25 in. (¼″) to about 3 in. (3″). In further aspects, the thickness can be from about 0.5 in. to about 1 in. Depending on the intended application, the panel can have any desired thermal resistance value (R-value). For example, the panel can have a R-value of at least about 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, or even 25 according to ASTM C1289-02. In a further aspect, the R-value can be in the range of about 1 to about 25. In still further aspects, the R-value can be any desired value within any range derived from any of the above exemplified values, including, for example, R-value in the range from about 1 to about 10, or from about 3 to about 7.

In various aspects, the insulation layer can optionally comprise a membrane layer. The insulation membrane layer can comprise radiant barrier material, such as metal foil, for example, aluminum foil, polymeric film or fabric, paper or cellulosic material, reinforcing scrim, such as fiberglass scrim, or a combination thereof. In some aspects, the membrane layer comprises a single or multi-layered material which can be a laminate in which a backing material is laminated to a foam insulation layer. In other aspects, one or more optional additives can also be incorporated into or otherwise applied to the foam insulation layer. Exemplary and non-limiting additives can include flame retardants, colorants, ultraviolet absorbers, textured coatings, and the like as well as any combinations thereof.

The insulation layer can be secured to the inward facing surface 22 of the panel, for example, by any conventionally used adhesive material known in the art to be compatible for use with foam insulation. For example, according to non-limiting aspects of the invention, the adhesive can be selected from a phenol-formaldehyde resin, hot-melt adhesive, polyvinyl acetate (PVA) resin, or any combination thereof. In still further aspects, the adhesive can be isocyanate-based.

The insulated panels disclosed herein can exhibit improved physical strength and durability over conventional sheathing panels in the absence of a foam insulation layer. Thus, in one aspect, the inventive insulated panels can exhibit enhanced structural strength and dimensional stability when compared to a conventional sheathing panel in the absence of the insulation layer when exposed to substantially the same environmental and/or physical forces under substantially similar conditions. To that end, the foam insulation layer can have a dimensional stability of about less than 5, 4, 3, 2, or even less than 1% according to ASTM D2126. In a further aspect, the dimensional stability is preferably about less than 2%. The foam insulation layer can also have any desired compressive strength. For example, the foam insulation layer can have a desired compressive strength of at least about 1, 5, 10, 15, 20, 25, 30, 35, or even at least about 40 pounds per square inch (psi) according to ASTM D1621. In a further aspect, the compressive strength can be in the range of about 1 to about 40 psi. In a still further aspect, the compressive strength can be any desired value within any range derived from any of the above exemplified values, including, for example, a compressive strength in the range from about 15 to about 30 psi, or from about 20 to about 25 psi. Likewise, the foam insulation layer can have any desired tensile strength. For example, the foam insulation layer can have a tensile strength of greater than about 300, 400, 500, 600, 700, 800, 900, 1000, 1500, or even greater than about 2000 pounds per cubic foot (pcf) according to ASTM D1623. In further aspects, the tensile strength can be in the range of about 300 to about 2000 pcf. In still further aspects, the tensile strength can be any desired value within any range derived from any of the above exemplified values, including, for example, a tensile strength in the range from about 500 to about 1000 pcf, or from about 600 to about 800 pcf.

As previously discussed, moisture can be present in a wall or roof system as bulk water or water vapor. Water vapor, if allowed to pass into or onto a foam insulation layer, can condense into bulk water either within the insulation, negating the overall thermal performance of the insulation, or between the foam insulation and adjacent layer, supporting mold and fungus growth. In various aspects, the inventive insulated panels provide a structural wall and roof system that can exhibit improved durability and maintenance of thermal performance over traditional sheathing panels or foam panels. Thus, the design of the inventive insulated panels can allow greater long-term performance and retention of R-values when compared to a conventional or reference foam panel when exposed to substantially the same environmental and/or physical forces under substantially similar conditions.

As briefly described herein, external foam sheathing can have significant disadvantages as it can easily become damaged during the construction process. Furthermore, when exposed to physical and environmental elements, thermal resistance performance can quickly deteriorate. Moreover, foam sheathing can limit exterior surface finishing options. In various aspects, the design of the present wall and roof system can further provide structure and durability, while enhancing thermal performance and eliminating thermal bridging.

In an exemplary embodiment of the invention, the installation configuration of the system 10 is shown in FIG. 1. In one aspect, the panels 20 are attached to the rafters of an underlying supporting structural frame. In a further aspect, the attachment pattern may be edge to edge, tongue-and-groove or any other appropriate construction alignment. In a yet further aspect, the panels are secured to the structural frame, with the foam insulation layer 21 facing inwardly, toward the interior of the building. Thus, the panel provides a nailable wood substrate, while providing the increased thermal performance of a foam sheathing. In a yet further aspect, the wood substrate provides improved external security and durability over foam sheathing. In an even further aspect, the improved external durability improves long-term thermal and structural performance.

In another exemplary embodiment, FIG. 5 illustrates the cross-sectional profile of the panel for a panelized roof or wall sheathing construction system 10. When attached to a building frame, joints 25 form between the panels 20. In a further aspect, shown is a water-resistant sealant comprised of strips of water-resistant tape 42 with backing 44 and an adhesive layer 46. In a still further aspect, each of the strips of tape 42 can be applied, for example, by a hand held tape applicator to at least one joint between adjacent panels 20 to form a substantially moisture-resistant seam with roofing accessory materials such as skylights, ventilation ducts, pipe boots, felt, flashing metals, roofing tapes, and various building substrates. In a yet further aspect, the tape 42 of the present invention may have no backing or a backing 44 with a thickness of about ½ to about 1/30 the thickness of the adhesive layer 46. In an even further aspect, the strips of tape 42 may have a backing of a thickness of about 1.0 mils to about 4.0 mils and an adhesive layer disposed on the backing of a thickness of about 2.0 mils to about 30.0 mils. The dry coefficient of friction for the tape is preferably of at least about 0.6. In a further aspect, the panels, as shown in FIG. 3, can comprise alignment guides 43 on the panel for applying the tape strips 42 to facilitate installation. In a yet further aspect, the alignment guides 43 are placed approximately a distance of about ½ the width of the tape from the panel edge. In a preferred aspect, the tape strips 42 are installed by means of a handheld tape applicator.

The panels 20 of the panelized sheathing construction system 10 preferably have a first edge which is parallel with a corresponding second edge of a panel 20 and are preferably linked together via one of a tongue 27 and groove 28 configuration (FIG. 5), an H-clip configuration, or a mating square edge configuration, as would be understood by one skilled in the art. In a further aspect, each of the first and second edges, as seen in FIG. 6, preferably have contiguous sections of equal length, with each section potentially including a groove 28 and a tongue 27 compatible with a corresponding groove 28 (and tongue 27). An example of one such tongue and groove panel is shown and described in U.S. Pat. No. 6,772,569 entitled “Tongue and Groove Panel” which is incorporated herein by reference.

Another such example is shown and described in U.S. Pat. Pubs. 2004/0105950A1 and 2005/0246998 entitled “Composite Wood Board having an Alternating Tongue and Groove Arrangement along a Pair of Edges” which are incorporated herein by reference. In a further aspect, the length of the first edge of each panel 20 is preferably a multiple of the length of a section, with the multiple being at least two. In a still further aspect, the length of the tongue 27 in each section measured in the longitudinal direction of an edge is preferably less than or equal to the length of the grooves 28, or the longest groove 28 in each section.

Referring to FIG. 11, the panel 20, in one aspect, can have a first edge A, a second edge B, a third edge C and a fourth edge D. Edges A and B can be parallel. Edges C and D can be parallel and substantially perpendicular to edges A and B. In a further aspect, each of the edges A and B of panel 20 can include an alternating tongue and groove arrangement. In a further aspect, edge A includes perpendicularly extending tongues 27 and grooves 28. In a yet further aspect, edge B is similarly constructed, and includes tongues 27 and grooves 28. In an even further aspect, edge C is in contact with tongue 27 of edge B and groove 28 of edge A. In a still further aspect, edge D is in contact with groove 28 of edge B and tongue 27 of edge A. Thus, in various aspects, the tongues and grooves of panel 20 are directly opposite each other.

The tongues 27 and grooves 28 along edge A of panel 20 can be brought into engagement with the grooves 28 and tongues 27 of edge B of adjacent panel 20 (FIGS. 12A and 12B). Thus, if one of the boards 20 is rotated one hundred and eighty degrees, the tongues 27 and grooves 28 along abutting edges can be brought into engagement.

In various aspects, a method for producing water-resistant building panels of the present invention comprises the steps of providing a roll of dry paper, feeding a leading edge of a sheet of paper from said roll of dry paper onto a forming belt, and depositing reconstituted lignocellulosic furnish with an applied binding agent atop the dry paper sheet so as to form a lignocellulosic mat having first and second lateral edges (FIG. 10). In a further aspect, the flake mat and the dry paper sheet are cut into a segment of a predetermined length. In a still further aspect, the top surface of the flake mat is compressed and the first and second lateral edges of the flake mat are packed prior to the cutting step. In a yet further aspect, the segments are transferred onto a loading screen and then into a hot press. In an even further aspect, sufficient heat and pressure are provided in order to set the panel structure and to form a skid-resistant surface resulting from the screen imprint on said paper. In a still further aspect, the segments are cut into panels of predetermined sizes. In a yet further aspect, the paper sheet is preferably wet prior to transferring the segment onto the loading screen. In an even further aspect, indicia 37 for positioning fasteners or sealant alignment guides 43 are preferably marked onto the panel.

As a person becomes accustomed to walking on sloped surfaces such as roof systems, a small change in the coefficient of friction can cause someone to easily lose his or her footing. This aspect is illustrated in Table 1, which shows the coefficient of friction of plywood, OSB, those panels with securely fastened roofing felt and OSB and plywood with loose felt paper applied. The significant differences seen in the coefficient of friction of systems between felt paper being securely fastened and loose, is more than enough to cause a slipping hazard. In various aspects, the present system 10 has an advantage over felt paper in that the coefficient of friction does not change since the barrier layer 30 is secured to the panel 20 prior to installation, thus, virtually eliminating the occurrence of paper coming loose in the field.

TABLE 1 ANOVA table showing the differences in the coefficient of friction between common rooflag panels of plywood and OSB and the use of felt that is securely fastened or loose on these panels. The coefficient of friction of the panel of a preferred embodiment is also shown for reference. Analysis of Variance for CoF Source DF SS MS F P Product  5 2.47230 0.49446 151.42 0.000 Error 66 0.21552 0.00327 Total 71 2.68782 Individual 95% CIs For Mean Based on Pooled StDev StDev

0.0516            

Level N Mean 0.0233                 

Embodiment 1 12 0.9043 0.0323

Felt 12 0.9973 0.0432  

Loose felt¹ 12 0.5136 0.0771  

Loose felt² 12 0.5646 0.0868              

OSB 12 0.7381

plywood 12 0.9360 0.60    0.75    0.90 Pooled StDev = 0.0571 ¹Loose felt over OSB substrate. ²Loose felt over plywood substrate.

In many aspects, it is important that the panels used in roof applications are not slippery in service. It has also been observed that the coefficient of friction can vary among roof sheathing products of similar types from different sources. Further, the coefficient of friction of panels from one manufacturer can change dramatically, such as when the panels get wet from a change in weather conditions or morning dew. Further, the change in coefficient of friction can be inconsistent among manufacturers. This may be the result of process conditions, wood species, and raw materials used to manufacture these products. Sanding does not improve friction for sheathing panels even though it removes a top layer of wood that may be partially degraded by the process conditions, but it does promote adhesion for secondary lamination. Flat laminated products are perceived to be more slippery than textured products, and water on many substrates makes them slippery when wet. An anti-skid coating can be added to improve the coefficient of friction, but these coatings add additional manufacturing steps, equipment, and cost. Indeed, when plywood or OSB panels are overlaid with paper to create a smooth surface, the coefficient of friction drops compared to regular plywood and OSB. Adding texture to the surface of OSB has been suggested as a method of improving friction or skid-resistance of these panels, but testing of OSB sheathing using the English XL Tribometer indicated that the coefficient of friction of the smooth and textured sides of OSB were very similar under dry conditions and that the texture could decrease the coefficient of friction in the wet condition, which is shown in Table 2.

TABLE 2 ANOVA table showing the differences in the slip angle between the textured and smooth sides of OSB in the dry and wet condition and plywood in the wet and dry condition. The coefficient of friction is related to slip by CoF = Tan (slip angle). where the slip angle is expressed in radians. Source DF SS MS F P Factor  5 232.33 46.47 12.46 0.000 Error 90 335.63  3.73 Total 95 567.96 Individual 95% CIs For Mean Based on Pooled StDev Level N Mean StDev

dry-plywood 16 42.000 0.177            

dry-Textured 16 41.500 0.530           

dry-Smooth 16 42.063 0.442            

wet-plywood 16 40.000 1.237  

wet-Textured 16 37.625 0.530

                   wet-Smooth 16 39.938 1.326  

38.0    40.0    42.0 Pooled StDev = 0.824

Thus, in various aspects, another notable advantage of the present invention is retained skid resistance when wet. When texture is added to the surface of an overlaid wood composite panel of the present invention, the coefficient of friction is unexpectedly increased above that of standard plywood and OSB.

Further exemplary aspects of the present invention is illustrated in Tables 3 & 4 and Plots 2 & 3, which shows the coefficient of friction of the screen imprinted overlaid panel vs. smooth overlaid panels, oriented strand board with a screen imprint, oriented strand board that has been sanded and plywood in dry and wet conditions. Paper basis weights (per ream) of 31.751 kg (70 lbs.), 44.906 kg (99 lbs.) and 59.874 kg (132 lbs.) were also tested and compared to show that the range of paperweights mentioned in the embodiment of this record of invention will satisfy the coefficient of friction requirements.

From testing conducted using the English XL Tribometer, the coefficient of friction, as can be seen from Table 3, is significantly higher when a screen imprint is embossed on the surface of the panels as compared to the smooth surface of paper-overlaid panels. From Table 4, it can be seen that the coefficient of friction of the overlaid panels with the textured surface does not significantly decrease when wet and is much better than the coefficient of friction of plywood when wet.

TABLE 3 ANOVA table showing the differences in the coefficient of friction between paper overlaid panels with a smooth surface and with a textured imprint as well as oriented strand bound with a textured imprint, oriented strand board sanded and polywood in the dry condition. “Level” is expressed as paper basis weight (in lbs.) per roam for overlay panels. Source DF SS MS F P Product  8 0.90809 0.11381 16.4 0.000 Error 177 1.22522 0.00692 Total 185 2.13331 Based on Pooled StDev Level N Mean StDev

132 Paper Smooth 23 0.9125 0.1045

       lbs. 132 Paper Textured 20 1.0614 0.0269                

lbs. 70 Paper Textured 20 0.9882 0.0422     

lbs. 70 Paper Smooth 20 0.9106 0.1148

             lbs. 99 Paper Textured 20 1.0533 0.0319                

lbs. 99 Paper Smooth 24 0.9343 0.1079

         lbs. OSB Sanded 26 0.8391 0.1103

                  OSB Textured 17 0.9801 0.0428   

Plywood 16 0.9864 0.0666   

0.880   0.960   1.040 Pooled StDev = 0.0832

In one exemplified example of the present invention, a roll of kraft paper of 44.9 kg (99 lb.) basis weight (per ream), saturated to about 28% by weight resin content with a glue line of phenolic glue of about 4.536 kg/304.8 m² (10-lbs/1000 ft²) applied to one side of the paper was mounted onto a paper feeding apparatus so that the paper could be fed onto the forming line of an oriented strand board.

The paper was then fed onto the forming line belt with the glue line side of the paper facing up away from the belt. To prevent wrinkling or tearing of the paper, the paper roll must be un-wound at a speed that is consistent with the speed of the forming line. To maintain complete coverage of the paper overlay onto the wood composite substrate, the paper is aligned with the forming line belt as it carries the mat toward the press.

Once the paper is fed onto the forming line, a wood mat is formed on top of the paper as it moves toward the press. The wood mat is formed with the first and second layers being the surface layers composed of strands oriented in a direction parallel to the long dimension of the panels and a third core layer composed of strands oriented in a direction perpendicular to the first and second layers.

TABLE 4 Analysis of Variance for CoF Wet Source DF SS MS F P Product  6 1.59735 0.26623 207.03 0.000 Error 136 0.17489 0.00129 Total 142 1.77224 ANOVA table showing the differences in the coefficient of friction between paper overlaid wood composite panels with smooth and textured surfaces and plywood in the wet condition. “Level” is expressed as paper basis weight per ream for overlap panels. CoF = Coefficient of friction. Individual 95% CIs For Mean Level Based on Pooled StDev 1 N Mean StDev

32 Paper Smooth 23 0.8180 0.0373

              lbs. 132 Paper Textured 20 1.0410 0.0294          

lbs. 70 Paper Textured 20 1.0125 0.0286        

lbs. 70 Paper Smooth 20 0.8003 0.0426

              lbs. 99 Paper Textured 20 1.0386 0.0284          

lbs. 99 Paper Smooth 24 0.8039 0.0432

               lbs. Plywood 16 0.8882 0.0362

   

0.800 0.880 0.960  1.040 Pooled StDev = 0.0359

FIG. 13 illustrates box plots showing the differences in the coefficient of friction between paper overlaid wood composite panels with smooth and textured surfaces, oriented strand board with a textured surface, oriented strand board with a sanded surface and plywood in the dry condition. “Level” is expressed as paper basis weight per ream for overlay panels. CoF=Coefficient of friction.

FIG. 14 illustrates box plots showing the differences in the coefficient of friction between paper overlaid wood composite panels with smooth and textured surfaces, oriented strand board with a textured surface, oriented strand board with a sanded surface and plywood in the dry condition. “Level” is expressed as paper basis weight per ream for overlay panels. CoF=Coefficient of friction.

FIG. 15 illustrates box plots showing the differences in the coefficient of friction between paper overlaid wood composite panels with a smooth and textured surface and plywood in the wet condition. “Level” is expressed as paper basis weight per ream for overlay panels. CoF=Coefficient of friction.

During this process, flakes can be pushed underneath the paper overlay and can be pressed on to the surface of the panel, giving the panel a low quality look and hindering the performance of the final product. Therefore, air wands are used at the nose of the forming line to remove the excessive flakes between the paper overlay and the forming line belt.

The mat is then cut into a predetermined size for placing into press. The cut mats are then moved over the nose on the forming line (where the flakes are removed from the paper's surface using the air wands) and picked up by a screen embossed transfer mat. If appropriate, in the production of oriented strand board, the screen embossed transfer mat is sprayed with a release agent to keep the flakes from sticking to the press. However, given that there is a kraft paper overlay between the flakes and the mat, the release agent is not needed. To prevent the wood mat from slipping off the transfer mat during acceleration, water is sprayed on the surface of the transfer mat prior to the transfer mat picking up the wood mat.

The screen embossed transfer mat and wood mat are then placed in a hot press at a temperature preferably greater than 360° F. for a period long enough to cure the binders on the wood flakes.

The transfer mat then moves the pressed master mat out of the press, removing the screen embossed transfer mat from the wood master mat, leaving an embossed pattern on the surface of the paper overlay. The embossed pattern has hills and valleys with a distance between the valleys and hills of preferably about 0.03048 cm ( 1/1000 inch) to about 0.3048 cm ( 10/1000 inch). The pattern is enough to provide needed skid resistance without puncturing the paper overlay, compromising the water-resistant quality of the panel.

Once the master mat is removed from the press, it can be cut into any dimension to meet the needs of the final user and the edges of the panels sealed with an edge seal coating.

It is understood by those skilled in the art that a continuous press could be used to manufacture overlay panels. One obvious change in the method would be that mastermats would be cut to size after leaving the press.

B. Use of Panel for Wall Sheathing

According to an alternate embodiment of the present invention, FIG. 7 shows wall panels 120 joined to a building frame structure 115. Similar to the roof panels, the wall panels 120 have barrier layers bonded on one surface, an insulation layer 131 secured on one surface, and are generally attached to the building frame 115 in substantially abutting relationship with a plurality of fasteners such as nails, screws, or any other suitable fastener known on the art (not shown) so as to form joints therebetween. Also similar to the roof panel, the wall panel also preferably comprises a textured surface as described previously above.

Depending on the size of the panels 120 selected, the panels 120 may be installed with a horizontal or vertical orientation. In the exemplary embodiment shown in FIG. 7, panels 120 are installed vertically and horizontally and can typically be, but are not limited to a 1.219 m×2.438 m (4 ft.×8 ft.) construction. In a further aspect, a panel may be 1.219 m×3.048 m (4 ft.×10 ft.), 1.219 m×3.658 m (4 ft.×12 ft.), or of any desired size for the particular build.

As is well known in the field, the panels 120 can be structural and can comprise a wood composite, such as veneers, strands, wafers, particles, fibers, and binders, or may be made from any building grade material as required for the particular build. In a further aspect, the preferred dimensions of the wall panels 120, including the length L, width W, and thickness T of the panel can be designed to fit the particular application. In one aspect, a one half inch thick panel T is used, however, in a further aspect, a 0.635 cm (quarter inch) to 3.175 cm (1.25-inch) thick panel 120 or thicker can be used if heavier construction is desired.

In one embodiment shown in FIG. 8, the structural panels 120 are quadrilateral in shape comprising an inward facing surface 121, an outward facing surface 122 and a peripheral edge, the peripheral edge defining a first 123, second 124, third 125 and fourth 126 edge of the panel 120. In a further aspect, the first edge 123 of the panel is parallel with the corresponding third edge 125 of the panel, each of the first 123 and third 125 edges having opposing sections of equal length, and the second edge 124 of the panel is parallel with the corresponding fourth edge 126 of the panel, each of the second 124 and fourth 126 edges having opposing sections of equal length. In a still further aspect, the first 123 and third 125 edges of the panel are substantially perpendicular with adjacent second 124 and fourth 126 edges. In a further aspect illustrated in FIG. 9A, one or more of the edges of the panel 120 may provide at least one tongue-and-groove 129 shape for joining and securing panels 120 together.

Where the tongue-and-groove configuration is utilized, opposing edges have a groove or tongue compatible with an opposing corresponding edge and the length of the tongue in each section measured in the longitudinal direction of an edge is less than or equal to the longest grooves in each section. In an alternative aspect, as shown in FIG. 9B, the panels 120 can have flat surfaces 128 and be planar on all four peripheral edges 123, 124, 125, 126.

In one aspect, as depicted in FIG. 8, a barrier layer 130 is comprised of a paper 132 with at least two sides. During the construction stage of the panels 120, a barrier layer 130 is bonded to each panel 120 to form the barrier. In a further aspect, the barrier layer 130 can comprise an UV-resistant overlay, a radiant reflective layer or the like. In a still further aspect, the barrier layer 130 is preferably comprised of three parts: paper 132, at least one of a resin 134 and a glueline layer 136, each of which may affect the durability and the final permeability of the panel 120. In a yet further aspect, the paper 132 has a paper basis weight of about 21.772 kg (48 lbs.) to about 102.058 kg (225 lbs.) per ream or a dry weight about 78.16 gm/m² (16 lbs./msf) to about 366.75 gm/m² (75 lbs./msf), however various basis weight papers 132 may be utilized for barrier layer 130. In an even further aspect, the paper 132 is preferably resin-impregnated with a resin 134 such as, but not limited to a phenol-formaldehyde resin, a modified phenol-formaldehyde resin, or other suitable resin. In a still further aspect, the paper has a resin content in a range of about 0% to about 80% by dry weight. In a yet further aspect, the paper has a resin content in a range of about 20% to about 70% by dry weight. In an even further aspect, the resin 134 may be saturated on 152 and then partially cured 153 to the paper 132. This enables the paper 132 to retain the resin 134 and makes the resin-impregnated paper 132 easier to handle.

In a further aspect, the barrier layer may optionally comprise an applied coating layer. In a still further aspect, one such coating is an experimental acrylic emulsion coating from Akzo-Nobel. In a yet further aspect, another suitable coating is Valspar's Black Board Coating. It is understood that by those skilled in the art that other classes of coatings may serve as an appropriate barrier layer. Thus, in various aspects, coatings may be used in combination with paper overlays to add desired functions to the panel.

Generally, an adhesive 136 is used to bond 155 the surface overlay member 130 to the outward facing surface of each of the plurality of panels 120. In a further aspect, the adhesive 136 is applied 154 to one side of the barrier layer 130 to facilitate attachment to the panels 120 during manufacture. In a still further aspect, a glueline layer 136 is of a range from about 4.885 gm/m² (1 lbs./msf) to about 244.5 gm/m² (50 lbs./msf). In an even further aspect, the glueline layer 136 has of a range from about 34.18 gm/m² (7 lbs./msf) to about 58.59 gm/m² (12 lbs./msf), creating a very efficient and durable bond. As mentioned previously, the glueline layer 136 may be composed from the group phenol-formaldehyde resin, hot-melt, PVA resin, or a combination thereof. In a further aspect, the glueline layer can be isocyanate-based.

According to various aspects, the barrier layers 130 of the disclosed panels are generally resistant to bulk water but permeable to water vapor. For example, the barrier layers can have a water vapor permeance in a range from about 0.1 U.S. perms to about 50.0 U.S. perms, including exemplary water vapor permeance of 0.1, 1, 2, 5, 7, 10, 15, 20, 25, 25, 30, 35, 40, 45, 50 U.S. perms. According to further aspects, the barrier layer can have any water vapor permeance value within any range derived from any of the above exemplified water vapor permeance values, including, for example, from about 0.1 to 20 perms.

Additionally, the barrier layers can have any desired water vapor transmission rate. For example, the barrier layers can have a desired water vapor transmission rate from about 0.1 to about 25 g/m²/24 hrs (at 73° F.-50% RH) according to ASTM E96 procedure A), including exemplary water vapor transmission rates of 0.1, 1, 2, 5, 7, 10, 15, 20, 25, 25 g/m²/24 hrs. According to further aspects, the barrier layer can have any water vapor transmission value within any range derived from any of the above exemplified water vapor transmission rates, including, for example, from about 0.7 to about 7 g/m²/24 hrs.

In further aspects, the barrier layers can have a desired water vapor permeance from about 0.1 to about 50 U.S. perms (at 73° F.-50% RH) via ASTM E96 procedure B), including exemplary water vapor permeance of 0.1, 1, 2, 5, 7, 10, 15, 20, 25, 25, 30, 35, 40, 45, 50 U.S. perms. According to still further aspects, the barrier layer can have any water vapor permeance within any range derived from any of the above exemplified water vapor permeance values, including, for example, from about 0.1 to about 12 U.S. perms.

The barrier layers can also have a liquid water transmission rate from about 1 to about 28 grams/100 in²/24 hrs (via Cobb ring) according to ASTM D5795. This test method allows the quantification of liquid water that passes through the underlayment to the underlying substrate and can be easily done on specimens where the underlayment cannot be removed for visual inspection.

According to further aspects, and as depicted in FIG. 8, the panel for the panelized roof or wall system 110 can comprise an insulation layer 131 secured to the inward facing surface 121 of panel 120. Preferably, the insulation layer 131 at least substantially covers the inward facing surface 121 of the panels 120.

The insulation layer can comprise any suitable insulation material conventionally known to one of ordinary skill in the art. For example, the insulation layer can comprise a foam polymer insulation, including for example and without limitation, polyisocyanurate foam, polystyrene foam, polyurethane foam, or any combination thereof. In further exemplary aspects, the foam insulation layer comprises polyisocyanurate foam. In still further aspects, the foam insulation layer can comprise a blend or combination of a polyisocyanurate and polyurethane foam.

The foam insulation layer can comprise extruded foam, expanded foam, or a combination thereof. As one of ordinary skill in the art will appreciate, extruded foams can be prepared by melting a suitable polymer material, incorporating a blowing agent to yield a foamed gel, and extruding the foamed gel through a die to form the desired foam layer. Expanded foams can be prepared by subsequent expansion of beads containing a blowing agent, wherein the expanded beads are molded at the time of expansion to form the desired foam layer.

The foam insulation can have any desired density. For example, the foam insulation can have a density of at least about 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, or even at least about 20 pounds per cubic feet (pcf) according to ASTM D1622. In further aspects, the foam insulation can have a density in the range of about 1 pcf to about 20 pcf. In still further aspects, the foam insulation density can be any desired value within any range derived from any of the above exemplified values, including, for example, a density in the range from about 2 to about 5 pcf, or from about 1 to about 10 pcf.

The foam insulation can be either closed cell or open cell. Open cell foam is more likely to let water vapor condense inside the cells, thereby reducing the insulation value. Thus, in further exemplary aspects, the foam insulation is closed cell. In a further aspect, the foam insulation is greater than about 50, 60, 70, 80, or even greater than about 90% closed-cell according to ASTM D2856.

Since water can negatively impact thermal performance, the foam insulation preferably exhibits limited or substantially no water absorption. For example, the foam insulation exhibits a water absorption of less than about 10, 9, 8, 7, 6, 5, 4, 3, 2, or even less than about 1% according to ASTM C209. In a further aspect, the foam insulation exhibits a water absorption of less than about 10, 9, 8, 7, 6, 5, 4, 3, 2, or even less than about 1% according to ASTM C2842. In a still further aspect, the foam insulation can exhibits a water absorption in the range of about 10 to about 0%. In a yet further aspect, the water absorption can be any desired value within any range derived from any of the above exemplified values, including, for example, a water absorption in the range from about 0 to about 5%, or from about 1 to about 3.5%.

Moreover, the foam insulation layer can have any desired water vapor permeance (or transmission) value. For example, the water vapor permeance can be about 20, 15, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, or even about 0 perms according to ASTM E96. In a further aspect, the water vapor permeance can be in the range of about 0 to about 20 perms. In a still further aspect, the water vapor permeance can be any desired value within any range derived from any of the above exemplified values, including, for example, a water vapor permeance in the range from about 0 to about 2 perms, or from about 1 to about 5 perms.

The insulation layer can have any desired thickness (t). This thickness (t) can be customized to fit any particular application and desired thermal resistance. For example, and without limitation, the thickness of the foam insulation layer can be in the range of from about 0.25 in. (¼″) to about 3 in. (3″). In further aspects, the thickness can be from about 0.5 in. to about 1 in. Depending on the intended application, the panel can have any desired thermal resistance value (R-value). For example, the panel can have a R-value of at least about 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 according to ASTM C1289-02. In a further aspect, the R-value can be in the range of about 1 to about 25. In still further aspects, the R-value can be any desired value within any range derived from any of the above exemplified values, including, for example, R-value in the range from about 1 to about 10, or from about 3 to about 7.

In various aspects, the insulation layer can optionally comprise a membrane layer. The insulation membrane layer can comprise radiant barrier material, such as metal foil, for example, aluminum foil, polymeric film or fabric, paper or cellulosic material, reinforcing scrim, such as fiberglass scrim, or a combination thereof. In some aspects, the membrane layer comprises a single or multi-layered material which can be a laminate in which a backing material is laminated to a foam insulation layer. In other aspects, one or more optional additives can also be incorporated into or otherwise applied to the foam insulation layer. Exemplary and non-limiting additives can include flame retardants, colorants, ultraviolet absorbers, textured coatings, and the like as well as any combinations thereof.

The insulation layer can be secured to the inward facing surface 121 of the panel, for example, by any conventionally used adhesive material known in the art to be compatible for use with foam insulation. For example, according to non-limiting aspects of the invention, the adhesive can be selected from a phenol-formaldehyde resin, hot-melt adhesive, polyvinyl acetate (PVA) resin, or any combination thereof. In still a further aspect, the adhesive can be isocyanate-based.

The insulated panels disclosed herein can exhibit improved physical strength and durability over traditional sheathing panels or foam panels. Thus, in one aspect, the inventive insulated panels can exhibit enhanced structural strength and dimensional stability when compared to a conventional or reference sheathing panel in the absence of the insulation layer when exposed to substantially the same environmental and/or physical forces under substantially similar conditions. To that end, the foam insulation layer can have a dimensional stability of about less than 5, 4, 3, 2, or even less than about 1% according to ASTM D2126. In a further aspect, the dimensional stability is preferably about less than 2%. The foam insulation layer can also have any desired compressive strength. For example, the foam insulation layer can have a desired compressive strength of at least about 1, 5, 10, 15, 20, 25, 30, 35, 40 pounds per square inch (psi) according to ASTM D1621. In a further aspect, the compressive strength can be in the range of about 1 to about 40 psi. In a still further aspect, the compressive strength can be any desired value within any range derived from any of the above exemplified values, including, for example, a compressive strength in the range from about 15 to about 30 psi, or from about 20 to about 25 psi. Likewise, the foam insulation layer can have any desired tensile strength. For example, the foam insulation layer can have a tensile strength of greater than about 300, 400, 500, 600, 700, 800, 900, 1000, 1500, 2000 pounds per cubic foot (pcf) according to ASTM D1623. In a further aspect, the tensile strength can be in the range of about 300 to about 2000 pcf. In a still further aspect, the tensile strength can be any desired value within any range derived from any of the above exemplified values, including, for example, a tensile strength in the range from about 500 to about 1000 pcf, or from about 600 to about 800 pcf.

In further aspects, the structural properties of the disclosed insulated panels make the insulated panels suitable for use in numerous structural applications, while still providing improved thermal performance. For example, in one aspect, the inventive insulated panels can be used as braced wall panels, when used in accordance with 2006 IBC Section 2308.3 and 2006 IRC Section R602.10.1 and installed in accordance with Table 5. In another aspect, the inventive insulated panels are considered equivalent to Construction Method 3 described in Section 2308.9.3 of the 2006 IBC and Section R602.10.3 of the 2006 IRC. In another aspects, the inventive insulated panels are suitable for use an alternative to wood structural panels in the construction of wood shear walls, when installed in accordance with 2006 IBC Section 2305.3 and Table 5. Allowable shear capacities for exemplary insulative panels are listed in Table 5 below.

TABLE 5 FASTENERS³ FRAMING Minimum ALLOWABLE⁵ Nominal Max. Stud Nominal Edge/Field Penetration SHEAR R-SHEATHING Stud Size Spacing Diameter Spacing into Framing CAPACITY⁵ TYPE⁴ (min.) (inches) (inches) (inches) (inches) (plf) R-3 2-by-4 16 0.131 5/12 1.5 211 R-3 2-by-4 16 0.131 4/12 1.5 261 R-3 2-by-4 24 0.131 4/12 1.5 261 R-6 2-by-4 16 0.131 4/12 1.5 232 R-6 2-by-4 24 0.131 4/12 1.5 232 For SI: 1 inch = 25.4 mm; 1 pound per foot (ppf) = 14.59 N/m. ¹All fasteners must be a minimum of ⅜ inch from panel edges. ²For framing of other species, the shear value above must be multiplied by the Specific Gravity Adjustment Factor = [1 − (0.55 − SG)], where SG = Specific Gravity of the framing lumber in accordance with the AF&PA NDS. This adjustment factor must not be greater than 1. ³Fasteners must be common nails or equivalent of a type generally used to attach wood sheathing. ⁴R-Sheathing Type R-6 panels have a foam plastic insulation thickness of 1.0 inch. R-Sheathing Type R-3 panels have a foam plastic insulation thickness of 0.5 inch. ⁵The shearwalls must have a maximum height-to-width aspect ratio of 2:1. ⁶The allowable shear capacity may be increased by 40% for wind in accordance with Section 2306.4.1 of the IBC.

In further aspects, as the plurality of resin-impregnated overlay bonded panels 120 are affixed to a building frame 115 in substantially abutting relationship, joints or seams are formed there between. Referring again to FIGS. 9A and 9B, enlarged cross sectional views of the system 110 show, for example, a plurality of strips of water-resistant pressure-sensitive seam sealant 140 for sealing the joints or seams between adjacent panels 120. In a further aspect, seam sealant 140 can, as understood by one in art, comprise laminate, caulk, foam, spray, putty, or other mechanical means. In a still further aspect, a plurality of strips of permeable tape 140 are used to seal seams between adjacent panels 120.

The permeability of the tape (or other sealant) used at the seams can be altered for the climatic zone (cold, mixed or hot/humid) and the building design used. In some climates in building designs, the tape may not need to be permeable since adequate permeability is available through the building envelope. In other climates in building designs, the tape will have to have a high level of permeability such that the moisture escapes from the interior spaces of the wall, and mold, fungus, etc. is not supported by the trapped moisture. Where a vapor barrier is required, the tape used will have a permeability of less than 1.0 US Perm.

In one aspect, the tape 140 comprises polyolefin (polyethylene preferred) backing of a thickness of about 2.5 mils to about 4.0 mils. In a further aspect, adhesive (butyl preferred) layer deposed on said backing is of a thickness of about 8.5 mils to about 30 mils. Where a permeable barrier is required, the tape has water vapor permeance of greater than 1.0 US perm at 73° F.-50% RH via ASTM E96 procedure B) and possibly, as high as 200 US perms or more.

Whether the tape 140 is impermeable or permeable to water vapor, it must be able to resist liquid water from entering into the building envelope. Since the seam tape will need to seal against the liquid water as traditional house wraps do, it is reasonable to require the tape to meet standards currently employed to measure liquid water penetration through house wraps, as would be readily known by one skilled in the art.

The technologies that are used to make films or fabrics with water vapor permeance greater than 1.0 US Perm are well known in the art. Tapes that have high water vapor permeance are often used in medical applications. Permeable tapes are made from a variety of processes and such tapes may be made by bonding a pressure sensitive adhesive to a permeable layer. To improve strength, the permeable layer can be bonded to a woven or non-woven backing. In a further aspect, tapes may have in their structure permeable fabrics, coatings, membranes, or combinations thereof.

Conventionally, standard wood panels used in applications where the wall sheathing is intended to be structural requires that the wood panels be directly secured to the building frame. Therefore, any additional thermal or insulative layer must be secured to the exterior facing of the building or between the framing members. As briefly described herein, external foam sheathing can have significant disadvantages, such as for example, it can easily become damaged during the construction process. Furthermore, when exposed to physical and environmental elements, thermal resistance performance can quickly deteriorate. Moreover, foam sheathing can limit exterior wall finishing options. In various aspects, the design of the present wall and roof system can further provide structure and durability, while enhancing thermal performance and eliminating thermal bridging.

In an exemplary embodiment of the invention, the installation configuration of the system 110 is shown in FIG. 7. In one aspect, the panels 120 are attached to the exterior facing sides of the building frame 115. In further aspects, the attachment pattern may be edge to edge, tongue-and-groove or any other appropriate construction alignment. In yet further aspects, the panels are secured to the building frame 115, with the foam insulation layer 131 facing inwardly, toward the interior of the building. As discussed herein, in certain applications, the disclosed insulated panels can be used as structural sheathing in the construction of walls without additional structural bracing.

Since the disclosed panels are preferably installed with the foam insulation layer facing inwardly, the installation configuration also provide a nailable wood substrate for exterior wall cladding, trim, or other accessories, while providing the increased thermal performance of a foam sheathing. In further aspects, the wood substrate provides improved external security and durability over foam sheathing. In still further aspects, the improved external durability improves long-term thermal and structural performance.

Conventional fastening means such as nails, ring-shank nails, screws, or approved fastening means can be used to attach the panel 120 to the frame 115. In a further aspect, the structure is sealed by injecting, spreading or otherwise applying 157 a moisture proofing seam sealant to each seam between adjoining panels 120 so as to create an impervious seam. There is no need for the seam sealant to be flush with the exterior major panel surfaces or to bind it into the gap between the panels. In a still further aspect, the seam sealant can be applied over the exterior surfaces as shown in FIGS. 9A and 9B to assure that a sufficient seal occurs given possible panel thermal or strain cycling with changes in temperature or humidity. The seam sealant is of various dimensions as required for the building.

In a further aspect, the presently described panels may also comprise a radiant barrier material attached to the lower face of the panel, i.e., to a face of the insulation layer or the face of the panel facing inwardly, toward the interior of the building. In a still further aspect, the radiant barrier material has a reflective surface that reflects infrared radiation that penetrates through the wall back into the atmosphere. The combination of this reflective function, as well as the foil's low emissivity, limits the heat transfer to the interior space formed in the interior of the building. By limiting the heat transfer, the interior space temperature is reduced, which in turn reduces the cost of cooling the house.

In a further aspect, the radiant barrier material can simply be a single layer radiant barrier sheet, such as metal foil, such as aluminum foil. In a still further aspect, the radiant barrier material can comprise a radiant barrier sheet adhered to a reinforcing backing layer made from a suitable backing material, such as polymeric film, corrugated paper board, fiber board or kraft paper. The backing material makes the foil material easier and more convenient to handle. In a further aspect, the multi-layered material may be a laminate in which a backing material is laminated to a radiant barrier sheet. In a still further aspect, the radiant barrier may be a coating.

In a further aspect, both the radiant barrier material and the barrier layer can be, for example, applied to the panel by spreading a coat of adhesive to the surface of the panel, applying the heat-reflecting material (or the barrier layer) over the adhesive onto the panel and pressing the radiant barrier material (or barrier layer) onto the panel. After the adhesive dries or cures, the panel is ready for use.

In various aspects, the panel of the present invention, when used as for roof and wall sheathing, exhibits improved friction under some common conditions found on construction sites. In further aspects, the panel of the presently described embodiment was preferably designed to achieve improved skid-resistance. In some aspects, when installing a wall sheathing, it is very important that the surface of the sheathing panels need to have sufficient skid resistance so that a person exercising reasonable care can work on the angled surfaces of the wall without ladder slippage.

Although preferable for panels to remain dry during installation on the construction site, the panels can be subject to moisture or wetness or have sawdust or other foreign materials deposited on their surface, which can reduce the coefficient of friction (CoF) and result in undesirable slippage. Sawdust is especially common on panel surfaces as panels often need to be cut to fit the roof properly. Sawdust can be a significant problem as it may cause a reduction in the coefficient of friction of the sheathing panel surfaces. Accordingly, it is desired to remove as much sawdust as possible from the panel surfaces prior to walking thereon. Although construction workers may take some efforts to clean the sawdust off the surface of the panels using a broom, tapping the board while on the edge, or using a leaf blower, these measures often prove to be inadequate. Specifically, these sawdust removal methods do not always completely remove the sawdust from the surface. Accordingly, a panel that restores adequate skid-resistance after removing as much sawdust as possible using any suitable means or method such as those described above is desired.

Improved performance after the removal of sawdust can be achieved, for example, in either of two ways. In a further aspect, one method of improving performance and retaining adequate friction after the removal of sawdust comprises using a saturating resin in the barrier layer which has a slightly higher fraction of volatiles. The percent volatiles can be a relative reflection of the average molecular weight of the saturating resin. Accordingly, a slight change in the percent volatiles can result in a measurable change in the depth of embossing achieved in the final cure. In one aspect, about a 6% increase in volatiles (as measured in the present experimentation from 3.5% to about 3.7% of the total weight of the resin-saturated paper, including the glueline) resulted in improved embossing in that the measured depth of at least some of the embossed features was measured to be deeper. A thorough discussion of the overlay technology, including the measurement of volatiles, is found in U.S. Pat. No. 5,955,203.

In a further aspect, an additional method of improving the frictional characteristics of the panel after the removal of sawdust was to change the type of wood furnish used to manufacture the paper in the paper overlay. In a still further aspect, it was discovered that changing the furnish used in the manufacture of the barrier layer from the typically used hardwood species to softwood species improved the retaining of friction after removal of sawdust.

To measure the friction in the presence of sawdust for the present embodiment, the coefficient of friction was measured using the English XL Tribometer. The standard techniques for using this equipment are described in ASTM F1679-04 and “Pedestrian Slip Resistance; How to Measure It and How to Improve It.” (ISBN 0-9653462-3-4, Second Edition by William English). The standard methods were used to compare the various test surfaces and conditions. To test the sheathing panels with sawdust, the amount of sawdust deposited on the surface of a panel near a saw cut was measured. The sawdust deposited on a panel surface was measured by placing sheets of paper on the surface of a panel and making cuts at the edge of the paper using a circular saw with a new blade. The amount of sawdust produced by the saw was under these conditions was 2.5 g/ft². The sawdust had a size distribution as shown in Table 7 (Runs 1-4: 20 g samples; Run 5: 60 g sample; all 15 min. on vibration screen shaker.) That amount of sawdust was applied to and spread across the test specimen surface evenly as possible, then the CoF was measured using the English XL Tribometer. The sawdust was removed by tilting on its edge and tapping it with a hammer to “knock” the sawdust off and the specimen's CoF in this state was then measured. The wet condition was measured according to the procedure described at pg. 173 in “Pedestrian Slip Resistance; How to Measure It and How to Improve It.” Since CoF can change depending on the surface, water was added in doses of about 1.54 g of water per test strike until the CoF remained constant. The CoF was measured for several configurations of sheathing panels and compared to existing sheathing materials as controls. The data are reported in Table 6.

In a further aspect, the overlay panel has a texture on the surface that imparts a satisfactory CoF on the exterior surface of the panel. As described previously in the prior panel embodiments, the texture results from pressing a screen into the surface of the panel and comprised major channels and minor indentations. In a still further aspect, the screen pattern is not symmetric, but has large channels that are roughly orthogonal to much smaller channels that are inside the larger channels. In a yet further aspect, the larger channels run up and down and the smaller channels run side to side when the panel is installed on a roof. It was found that a small difference in CoF was measured depending on the test direction. The average of four measurements (N, E, S, and W) is reported and the testing shown in the following tables was initiated so that the first measurement was taken with respect to the textured surface. N and S is measured along the direction of the major channels and E and W is measured generally orthogonally with the major channels. It was noted that some very small differences in CoF could be measured depending on the axis (N-S vs. E-W) along which the measurements were taken. It is also expected that the conditions under which the test is conducted will have some affect on the measured CoF. Variations in temperature and humidity may also have an affect on the measured CoF.

In further aspects, the texture preferably has a number of features or elements disposed in a first direction and a number of features or elements disposed in a second direction. In still further aspects, the elements or features disposed in first and second directions may be of similar or may be of different sizes. In yet further aspects, the elements similarly may be of different or of similar shapes. Non-limiting examples of similarly sized features include a embossed herringbone or a embossed basketweave configuration. In an even further aspect, a herringbone pattern may be very tightly disposed or may be somewhat “spread-out” in such a manner so that major channels with minor indentations are created.

In further aspects, the embossed textured surface is more preferably comprised of a plurality of major or primary textured features and a plurality of minor or secondary textured features. In still further aspects, the minor or secondary textured features are at least partially disposed on one or more corresponding major feature. Thus, in one aspect, while the general appearance of the exemplary textured surface 35 appears to be a random pattern of raised areas, a closer examination of the exemplary textured surface reveals finer detail. In further aspects, the exemplary textured surface 35 includes a plurality of major channels 33 that are disposed substantially parallel with a pair of opposing edges (preferably the shorter pair of opposing edges) of the panel. In still further aspects, a plurality of minor indentations 34 are disposed within the major channels 33 and run generally orthogonally to the major channels.

In various aspects, the present invention provides for advantageous slip-resistance by providing any number of major channels. In further aspects, the density of the major channels is about 5 to about 15 major channels per 2.54 cm (inch) as measured in a direction perpendicular to the direction of the major channels. In still further aspects, the density of the major channels is about 9 to about 12 major channels per 2.54 cm (inch) as measured in a direction perpendicular to the direction of the major channels. On a typical 1.219 m×2.438 m (4′×8′) sheathing panel, the major channels will preferably run generally across the 1.219 m (4′) or short direction. It should be appreciated that it is not necessary nor required that the major channels be exactly parallel and may undulate slightly from side to side in a somewhat serpentine fashion rather than being straight.

In various aspects, the minor indentations 34 according to the present invention may vary in length and width. In further aspects, the minor indentations 34 preferably have a elongated shape that measures preferably from about 0.0508 cm (0.020 inches) to about 0.254 cm (0.100 inches) in length and from about 0.0254 cm (0.010 inches) to about 0.254 cm (0.100 inches) wide. In various further aspects, the present invention provides for advantageous slip-resistance by providing any number of minor indentations. In further aspects, the density of the minor indentations is about 15 to about 35 of the minor indentations per inch as measured along the direction of the major channels. In still further aspects, the long direction of the minor indentations preferably extends generally across the eight-foot (or long) direction of a typical panel.

In accordance with the exemplary configuration of the textured surface 35, in a typical roof sheathing application using 1.219 m×2.438 m (4′×8′) panels where the 2.438 m (8′) edge of the sheathing panel is parallel to the floor of the home, the major channels 33 will generally be oriented up and down, while the long direction of the minor indentations 34 will generally run across the roof. In a further aspect, the depth of the major channels and minor indentations have been found to be in a range of about 5 to about 35 mils as measured by the Mitutoyo Surface Profiler. It should be appreciated that at least some of the major channels and minor indentations may be of a depth greater or deeper than the thickness of the paper (i.e., some of the major channels and minor indentations may be of a depth that would project into the surface of the panel).

For preparation of the test panels for the presently described embodiment, the overlay papers were bonded to mats in a primary process either in the lab or on the regular manufacturing line. Then, test specimens were cut from these panels. The conditions used to prepare the test panels in the laboratory were approximately: Press time: 5 minutes; Press temp: 200° C.; panel dimensions: 40.64 cm×40.64 cm×1.27 cm (16″×16″×0.5″) thick; target density: 41.5 pcf; wood species: mixtures of pine; resin loading: face; MDI @ 4%; PPF @ 2% Core; MDI @ 4.5%; and wax loading: 2%.

TABLE 6 The CoF data for improved sheathing panels. Average N-S E-W Specimen Condition CoF CoF CoF Softwood overlay Dry 0.83 0.79 0.87 paper Wet 0.77 0.76 0.78 Sawdust 0.48 0.47 0.47 After Sawdust 0.85 0.77 0.92 High volatiles Dry 0.83 0.79 0.86 overlay Wet 0.82 0.83 0.81 Sawdust 0.42 0.41 0.43 After Sawdust 0.83 0.80 0.85 OSB Dry 0.86 0.84 0.87 Wet 0.80 0.80 0.80 Sawdust 0.54 0.51 0.58 After Sawdust 0.72 0.73 0.71 Plywood Dry 1.0 >1 >1 Wet 0.84 0.83 0.85 Sawdust 0.53 0.54 0.52 After Sawdust 0.62 0.61 0.63

The measurements in Table 6 were taken under conditions of higher temperature and humidity as compared with earlier described testing conditions.

TABLE 7 Particle size distribution of sawdust used to measure CoF. Opening Sieve size (in No. microns) Run #1 Run #2 Run #3 Run #4 Run #5 18 1000 0.19 0.21 0.19 0.18 0.47 30 600 0.6 0.83 0.68 0.58 2.17 60 250 3.44 4.57 3.42 3.40 9.90 80 180 3.53 3.15 2.98 2.72 8.76 100 150 1.30 2.52 4.28 1.17 3.10 140 106 4.71 5.13 3.23 2.32 9.78 200 75 1.12 1.54 1.79 2.28 6.48 325 45 4.07 1.55 4.11 3.87 10.79 pan 0 0.57 0.07 1.92 2.97 8.00

In further aspects, the present invention also relates to various methods and systems using the disclosed insulated panels. For example, according to aspects of the invention, described herein is a panel system to externally envelope a structure, the system comprising: a) at least two panels, each panel including an outer surface, an inner surface, and at least one edge, each panel aligned with at least one edge proximate to at least one edge of at least one adjacent panel; b) a barrier layer secured to at least the outward facing surface of each panel, the barrier layer being substantially bulk water resistant; c) an insulation layer secured to the inward facing surface of said panel; and d) a bulk water resistant edge sealant sealing at least one gap of the at least one edge of each panel proximate to the at least one edge of each adjacent panel.

In another aspect, described herein is a panelized sheathing construction system for a building comprising: a) a building frame structure; b) a plurality of lignocellulosic panels attached to said frame structure in substantially abutting relationship so as to form joints therebetween, each one of said plurality of panels further comprising a first inward facing surface, a second outward facing surface and a peripheral edge; each one of said plurality of panels comprising: i) a substantially bulk water resistant barrier layer secured to at least the second outward facing surface of said panel; a plurality of water-resistant sealants, each of said sealants sealing at least one of said joints between adjacent panels; and ii) an insulation layer secured to the inward facing surface of said panel.

In another aspect, described herein is a method for drying-in a building comprising the steps of: a) providing a building frame structure in a staged or completed condition; providing a plurality of panels, each of said panels comprising lignocellulosic material and further comprising an inward facing surface, an outward facing surface and a peripheral edge, each of said panels further comprising a bulk water-resistant barrier layer secured to the outward facing surface of said panel; and each of said panels further comprising an insulation layer secured to the inward facing surface of said panel; and c) sealing the joints between adjacent panels.

In another aspect, described herein is a panelized sheathing construction system for a building having a frame structure comprising: a) first and second composite panels attached to the frame structure in a substantially abutting arrangement so as to form a joint therebetween, wherein each of the first and second panels further comprises an inward facing surface, an outward facing surface and a peripheral edge; and a substantially bulk water resistant barrier layer secured to at least the outward facing surface of the panel; each of said panels further comprising an insulation layer secured to the inward facing surface of said panel; and b) a water-resistant seal that covers the joint between the first and second panels.

While the present invention has been described with respect to several exemplary embodiments, a number of design modifications and additional advantages may become evident to persons having ordinary skill in the art. While the illustrative embodiments have been described in considerable detail, it is not the intention of the applicant to restrict or in any way limit the scope of the appended claims. 

1. A panel system to externally envelope a structure, the system comprising: a) at least two adjacent panels, each panel including an outer surface, an inner surface, and at least one edge extending therebetween, each panel aligned with its at least one edge proximate to the at least one edge of the adjacent panel and defining a longitudinal joint between the two adjacent panels; b) a barrier layer secured to at least the outward facing surface of each panel, the barrier layer being substantially bulk water resistant and substantially water vapor permeable; c) an insulation layer secured to the inward facing surface of said panel; and d) a bulk water resistant edge sealant sealing the joint between the proximate edges of the adjacent panels.
 2. The system of claim 1, wherein the insulation layer is foam insulation comprising polyisocyanurate foam, polystyrene foam, polyurethane foam, or a combination thereof.
 3. The system of claim 1, wherein the insulation layer has a density in the range of about 1 to about 20 pounds per cubic feet (pcf) according to ASTM D1622.
 4. The system of claim 1, wherein the insulation layer has a water absorption of less than about 10% according to ASTM C209 or ASTM C2842.
 5. The system of claim 1, wherein the insulation layer has a water vapor permeance from about 0.1 to about 20 perms as determined according to ASTM E96.
 6. The system of claim 1, wherein the insulation layer has a thickness of about 0.25 in. to about 3 in.
 7. The system of claim 1, wherein the system exhibits a thermal resistance value (R-value) from about 1 to about 15 according to ASTM C1289-02.
 8. The system of claim 1, wherein the insulation layer further comprises a membrane layer.
 9. The system of 8, wherein the insulation membrane layer comprises radiant barrier material, polymeric film, polymeric fabric, paper, cellulosic material, reinforcing scrim, or a combination thereof.
 10. The system of claim 1, wherein the insulation layer is secured to the panel using an adhesive selected from a phenol-formaldehyde resin, hot-melt adhesive, polyvinyl acetate (PVA) resin, or a combination thereof.
 11. The system of claim 1, wherein the insulation layer has a dimensional stability of about less than 5% according to ASTM D2126.
 12. The system of claim 1, wherein the insulation layer has a compressive strength of at least about 5 pounds per square inch (psi) according to ASTM D1621.
 13. The system of claim 1, wherein the insulation layer has a tensile strength of greater than about 300 pounds per cubic foot (pcf) according to ASTM D1623.
 14. The system of claim 1, wherein the barrier layer comprises a resin-impregnated paper substantially covering the outerward facing surface of the panel, the resin-impregnated paper having a paper basis weight of 21.772 kg (48 lbs.) to about 102.058 kg (225 lbs.) per ream and a resin content of less than 80% by dry weight.
 15. The system of claim 1, wherein each panel and barrier layer has a water vapor transmission rate from about 0.7 to about 7 grams/m²/24 hrs as determined according to ASTM E96 procedure A (at 73° F.-50% RH) and a liquid water transmission rate from about 1 to about 28 grams/100 in²/24 hrs via Cobb ring according to ASTM D5795.
 16. The system of claim 1, wherein an outer surface of the barrier layer is textured.
 17. The system of claim 16, wherein the textured outer surface provides a wet coefficient of friction in a range of about 0.8 to about 1.1 (English XL Tribometer) and a dry coefficient of friction of at least about 0.8 (English XL Tribometer).
 18. A method for externally sheathing and insulating a building structure, the method comprising the steps of: a) providing at least two panel assemblies, each panel assembly comprising: i) a lignocellulosic panel having an outward facing surface, an inward facing surface, and at least one edge; ii) a barrier layer secured to the outward facing surface of each panel, the barrier layer being substantially bulk water resistant and substantially water vapor permeable; and iii) an insulation layer secured to the inward facing surface of each panel; b) positioning each panel assembly such that the insulation layer contacts the structure; c) fastening each panel assembly to the structure; and d) sealing at least one gap of at least one edge of each panel proximate to at least one edge of each adjacent panel.
 19. A panel for a panelized sheathing construction system comprising: a) a lignocellulosic panel having a first inward facing surface, a second outward facing surface and at least one edge; b) a barrier layer secured to the outward facing surface of said panel, said barrier layer being substantially bulk water resistant; and c) a insulation layer secured to the inward facing surface of said panel.
 20. The panel of claim 19, wherein said barrier layer further comprises an applied coating layer. 